[nautilus/134-xf86back-and-xf86forward-not-working-anymore] build: Detect X11/XF86keysym.h to enable extra keys

[António Fernandes <antoniof src gnome org>]

commit 2c5882aaffd88ebd4bc477c8d94a3e56d2fcb2fb
Author: António Fernandes <antoniof gnome org>
Date:   Wed Nov 29 17:36:08 2017 +0000

    build: Detect X11/XF86keysym.h to enable extra keys
    
    Support for special keyboard keys for actions such as Back,
    Forward, Refresh, Go Home, etc. depends on this header.
    
    We used to check for this header in configure.ac but
    this was lost when porting from autotools to meson
    (commit 857a90c2).
    
    Restore this support by checking for this header with meson.
    
    Fixes #134

 config.h.meson | 1 +
 meson.build    | 4 ++++
 2 files changed, 5 insertions(+)
---
diff --git a/config.h.meson b/config.h.meson
index 8014bb678..ad2817675 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -3,6 +3,7 @@
 #mesondefine GETTEXT_PACKAGE
 #mesondefine HAVE_EXEMPI
 #mesondefine HAVE_SELINUX
+#mesondefine HAVE_X11_XF86KEYSYM_H
 #mesondefine ENABLE_DESKTOP
 #mesondefine ENABLE_PACKAGEKIT
 #mesondefine LOCALEDIR
diff --git a/meson.build b/meson.build
index 79702078e..060e8026e 100644
--- a/meson.build
+++ b/meson.build
@@ -81,6 +81,10 @@ if not tracker_sparql.found()
   tracker_sparql = dependency ('tracker-sparql-1.0')
 endif
 
+if cc.has_header ('X11/XF86keysym.h')
+    conf.set10 ('HAVE_X11_XF86KEYSYM_H', true)
+endif
+
 configure_file (input: 'config.h.meson',
                 output: 'config.h',
                 configuration: conf)